docs: rewrite README with structured overview and quick start guide

Replaces the minimal project description with a comprehensive README
including a component overview table, quick start instructions, common
Ansible operations, and links to detailed documentation. Aligns with
Red Panda Approval™ standards.

ansible/mcp_switchboard/mcp_switchboard.service.j2

@@ -0,0 +1,17 @@
+[Unit]
+Description=MCP Switchboard - Django Application
+After=network.target postgresql.service rabbitmq-server.service
+
+[Service]
+Type=notify
+User={{ mcp_switchboard_user }}
+Group={{ mcp_switchboard_group }}
+WorkingDirectory={{ mcp_switchboard_directory }}
+Environment="PATH={{ mcp_switchboard_directory }}/.venv/bin:/usr/local/bin:/usr/bin:/bin"
+EnvironmentFile={{ mcp_switchboard_directory }}/.env
+ExecStart={{ mcp_switchboard_directory }}/.venv/bin/gunicorn mcp_switchboard.wsgi:application --bind {{ mcp_switchboard_bind_host | default('0.0.0.0') }}:{{ mcp_switchboard_port }} --workers 4 --timeout 120
+Restart=always
+RestartSec=10
+
+[Install]
+WantedBy=multi-user.target